示例#1
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def test_multiplication_and_addition():
    assert evaluate('2 * 3 + 4') == 10
示例#2
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def test_simple_multiplication():
    assert evaluate('2 * 3') == 6
示例#3
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def test_two_multiplications():
    assert evaluate('2 * 3 + 4 * 5') == 26
示例#4
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def test_5_factorial():
    assert evaluate('2 * 3 * 4 * 5') == 120
示例#5
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def test_addition_multiplication():
    assert evaluate('2 + 3 * 4') == 14